11 Since ancient times people have found various ways to preserve meat
A eat B cook
C freeze D keep12 We packed up the things we had accumulated （积累） over the last three years and left.
A late B recent
C past D final
13 The expedition reached the summit at 10:30 that morning
A bottom of the mountain B foot of the mountain
C top of the mountain D starting point
14 There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.
A beats B destroys
C maintains D defends
15 The president proposed that we should bring the meeting to a close.
A stated B said
C suggested D announced
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